/***************************************************************************
                        syncobject.h  -  description
                        -------------------
Copyright (c) 2002 by
        James Critchley, Kurt Anderson,
        Rensselaer Polytechnic Institute, Troy, NY USA,
        and The Computational Dynamics Laboritory.
        
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

1.) Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

2.) Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

3.) The name of the authors, their employers, or sponsoring organizations may
not be used to endorse or promote products derived from this software without
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHORS, THEIR EMPLOYERS, OR SPONSORING ORGANIZATIONS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
***************************************************************************/

/*
This file was taken from the "multiproc" code associated with the
PhD Dissertation "A PARALLEL LOGARITHMIC TIME COMPLEXITY ALGORITHM FOR THE
SIMULATION OF GENERAL MULTIBODY SYSTEM DYNAMICS", CRITCHLEY, J.H., Rensselaer
Polytechnic Institute, 2003.
*/

#ifndef SYNCOBJECT_H
#define SYNCOBJECT_H

#include <semaphore.h>

class SyncObject {
public: 
        SyncObject(){};
        virtual ~SyncObject(){};

        virtual void SignalChild() = 0;
        virtual void SignalParent() = 0;
        virtual void WaitForChild() = 0;
        virtual void WaitForParent() = 0;
};

class NullSync : public SyncObject {
public: 
        NullSync(){};
        ~NullSync(){};

        void SignalChild(){};
        void SignalParent(){};
        void WaitForChild(){};
        void WaitForParent(){};
};

class CommSync : public SyncObject {
        sem_t *p_sem;
        sem_t *c_sem;
public: 
        CommSync();
        ~CommSync();

        void SignalChild();
        void SignalParent();
        void WaitForChild();
        void WaitForParent();
};

#endif
